Shares in Sunny Optical, which makes lenses for smartphones, lost nearly a quarter of their value after earnings missed estimates—the latest sign of investors’ unforgiving approach to companies that disappoint.

Carl Icahn no longer plans to solicit votes from Cigna shareholders against the health-insurer’s $54 billion deal to buy Express Scripts after two proxy-advisory firms recommended shareholders support the deal.

Tesla’s Elon Musk said he has been in talks with a Saudi Arabian sovereign-wealth fund about taking the electric-car maker private and believes two-thirds of current shareholders would remain with the company.